Some people are semi-achieving this using the v1 API. See API V3 - How to set contact custom fields on add/sync api calls. I think it’s pretty unbelievable that this functionality is not available out-of-the-box.
Some people are semi-achieving this using the v1 API. See API V3 - How to set contact custom fields on add/sync api calls. I think it’s pretty unbelievable that this functionality is not available out-of-the-box.